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Annotation of 43BSDTahoe/sys/netinet/tcp.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1982, 1986 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  *
                     17:  *     @(#)tcp.h       7.5 (Berkeley) 6/29/88
                     18:  */
                     19: 
                     20: typedef        u_long  tcp_seq;
                     21: /*
                     22:  * TCP header.
                     23:  * Per RFC 793, September, 1981.
                     24:  */
                     25: struct tcphdr {
                     26:        u_short th_sport;               /* source port */
                     27:        u_short th_dport;               /* destination port */
                     28:        tcp_seq th_seq;                 /* sequence number */
                     29:        tcp_seq th_ack;                 /* acknowledgement number */
                     30: #if BYTE_ORDER == LITTLE_ENDIAN 
                     31:        u_char  th_x2:4,                /* (unused) */
                     32:                th_off:4;               /* data offset */
                     33: #endif
                     34: #if BYTE_ORDER == BIG_ENDIAN 
                     35:        u_char  th_off:4,               /* data offset */
                     36:                th_x2:4;                /* (unused) */
                     37: #endif
                     38:        u_char  th_flags;
                     39: #define        TH_FIN  0x01
                     40: #define        TH_SYN  0x02
                     41: #define        TH_RST  0x04
                     42: #define        TH_PUSH 0x08
                     43: #define        TH_ACK  0x10
                     44: #define        TH_URG  0x20
                     45:        u_short th_win;                 /* window */
                     46:        u_short th_sum;                 /* checksum */
                     47:        u_short th_urp;                 /* urgent pointer */
                     48: };
                     49: 
                     50: #define        TCPOPT_EOL      0
                     51: #define        TCPOPT_NOP      1
                     52: #define        TCPOPT_MAXSEG   2
                     53: 
                     54: /*
                     55:  * Default maximum segment size for TCP.
                     56:  * With an IP MSS of 576, this is 536,
                     57:  * but 512 is probably more convenient.
                     58:  */
                     59: #ifdef lint
                     60: #define        TCP_MSS 536
                     61: #else
                     62: #define        TCP_MSS MIN(512, IP_MSS - sizeof (struct tcpiphdr))
                     63: #endif
                     64: 
                     65: /*
                     66:  * User-settable options (used with setsockopt).
                     67:  */
                     68: #define        TCP_NODELAY     0x01    /* don't delay send to coalesce packets */
                     69: #define        TCP_MAXSEG      0x02    /* set maximum segment size */

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